Stratrix
On the Record · NorthWestern Energy Group

NorthWestern Energy Group acquisitions, on the record

The businesses NorthWestern Energy Group bought and sold, as its annual reports describe them, with the cash it reported paying for acquisitions each year and every deal filing since 2016.

Deals its annual reports describe

BusinessDealWhenValue
Avista Corporation's 15 percent interest in each of Units 3 and 4 at the Colstrip Generating Station
Word for word“The Avista Agreement provides that the purchase price will be $0 and that we will acquire Avista's interest effective December 31, 2025, subject to the satisfaction of the closing conditions contained within the Avista Agreement.” 10-K for 2023
agreed acquisitionDecember 31, 2025$0
NW Corp
Word for word“On October 2, 2023, NW Corp and NorthWestern Energy Group completed a merger transaction pursuant to which NorthWestern Energy Group became the holding company parent of NW Corp.” 10-K for 2023
mergerOctober 2, 2023—
Avista Corporation's interest in Colstrip Units 3 & 4 (15%, 222 megawatts)
Word for word“As previously disclosed, in January 2023 and in July 2024, we entered into definitive agreements, the first with Avista Corporation (Avista) and the second with Puget Sound Energy (Puget), to acquire their respective interests in Colstrip Units 3 & 4 for $0.” 10-K for 2024
agreed acquisitionJanuary 2023$0
Puget Sound Energy's interest in Colstrip Units 3 & 4 (25%, 370 megawatts)
Word for word“As previously disclosed, in January 2023 and in July 2024, we entered into definitive agreements, the first with Avista Corporation (Avista) and the second with Puget Sound Energy (Puget), to acquire their respective interests in Colstrip Units 3 & 4 for $0.” 10-K for 2024
agreed acquisitionJuly 2024$0
Energy West natural gas utility distribution system and operations from Hope Utilities
Word for word“In July 2024, we entered into an Asset Purchase Agreement with Hope Utilities to acquire its Energy West natural gas utility distribution system and operations serving approximately 33,000 customers located near Great Falls, Cut Bank, and West Yellowstone, Montana for approximately $39.0 million, subject to certain working capital and other agreed upon closing adjustments.” 10-K for 2024
agreed acquisitionJuly 2024approximately $39.0 million
Black Hills Corporation
Word for word“Pursuant to the Merger Agreement, at the effective time of the Merger, each share of common stock of NorthWestern issued and outstanding as of immediately prior to closing will be converted into the right to receive 0.98 validly issued, fully paid and non-assessable shares of common stock of Black Hills, par value $1.00 per share (Black Hills Common Stock).” 10-K for 2025
agreed acquisition—0.98 validly issued, fully paid and non-assessable shares of common stock of Black Hills
Colstrip Units 3 & 4 ownership interests from Avista Corporation and Puget Sound Energy
Word for word“On January 1, 2026, we acquired an additional 40 percent ownership interest in Colstrip Units 3 & 4.” 10-K for 2025
acquisitionJanuary 1, 2026—

Deal filings since 2016

Read from NorthWestern Energy Group’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-12. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.